Abstract
In this research article, an organic polymer based polypyrrole (Ppy) composite material has been synthesized and analyzed for the design and fabrication purposes of a fast-responsive, highly sensitive, and an economical resistive-type novel humidity detection sensor. This humidity sensor most suitably serves the purpose for industrial humidity (i.e., values ranging from low to high) detection applications. First, a polypyrrole composite material (a mixture of polypyrrole, polypyrrole-NiO, polypyrrole-CeO2, and polypyrrole-Nb2O5) has been synthesized by chemical oxidative polymerization method, and then is treated at various temperatures, i.e., 100, 150 and 200 °C, respectively. After this treatment, the synthesized samples were then characterized by using FTIR, SEM, and DTA/TGA techniques for analyzing humidity sensing properties. The polypyrrole samples with the best morphological structure and properties were then incorporated on interdigitated electrodes. For the fabrication purposes of this thin film structure, at first a few drops of polyvinyl alcohol (PVA) were placed over interdigitated electrodes (IDE) and then the synthesized polypyrrole composite was uniformly deposited in the form of a thin film over it. The plots show that this is a good resistive-type humidity detection device for the relative humidity range of 30% to 90%. The response and recovery times of this newly fabricated humidity sensor were reported to be the same as 128 s at room temperature. Additionally, the stability and the repeatability response behavior of this Ppy sensor were verified up to five cycles of multiple repetitions. This presents an excellent stability and repeatability performance of the sensor. Furthermore, the capacitances versus humidity response and recovery properties of the designed sensor were studied too. This illustrates an excellent capacitive verses humidity response and shows a linear and an active behavior. Lastly, the experimental result proves that polypyrrole composite thin film shows a reasonable best performance up to a temperature of 100 °C.
Highlights
A radical cation is produced by an initial oxidation of pyrrole, which makes an electrophilic attack on a neutral molecule [2], as the electrochemical polymerization reaction only takes places when the oxidizing potential of polymer can cause the electrode surface to be zero
Being a famous suitable conductive polymer, polypyrrole can be prepared by three known methods named as chemical vapor deposition (CVD), electrochemical polymerization, and chemical oxidation polymerization in a solution [4]
Pyrrole (C4 H4 NH), niobium pentoxide (Nb2 O5 ), cerium oxide (CeO2 ), nickel oxide (NiO), and anhydrous iron (III) chloride (AR-grade) were all purchased from Sigma Aldrich, Korea
Summary
Being a famous conductive polymer, it shows a promising behavior for the stability of a product and or device along with the conversion of the corresponding cation to anion radicals. The electrochemical synthesis technique shows good results in the formation of polymers with good order. A radical cation is produced by an initial oxidation of pyrrole, which makes an electrophilic attack on a neutral molecule [2], as the electrochemical polymerization reaction only takes places when the oxidizing potential of polymer can cause the electrode surface to be zero. Being a famous suitable conductive polymer, polypyrrole can be prepared by three known methods named as chemical vapor deposition (CVD), electrochemical polymerization, and chemical oxidation polymerization in a solution [4]. The third one is mostly used by the researchers and scientists
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
